SANS Stormcast Wednesday, January 21st, 2026: Punycode Hunting; telnetd vuln; 6 day Certs and IP Certs; Oracle Patches

Add Punycode to your Threat Hunting Routine Punycode patterns in DNS queries make excellent hunting opportunities. https://isc.sans.edu/diary/Add%20Punycode%20to%20your%20Threat%20Hunting%20Routine/32640 GNU InetUtils Security Advisory: remote authentication by-pass intelnetd telnetd shipping with InetUtils suffers from a critical authentication by-pass vulnerability. https://www.openwall.com/lists/oss-security/2026/01/20/2 6-day and IP Address Certificates are Generally Available Let s Encrypt will now offer 6-day certificates as an option. These short-lived certificates can be used for IP addresses. https://letsencrypt.org/2026/01/15/6day-and-ip-general-availability Oracle Quarterly Critical Patch Update Oracle released its first quarterly patches for 2026, fixing 337 vulnerabilities https://www.oracle.com/security-alerts/cpujan2026.html#AppendixFMW